Roshan (22), and his accomplice Shesh Narain Rawat (26), were nabbed from Atta village of neighbouring Noida and looted jewellery worth about Rs 20 lakh and Rs 3 lakh in cash were recovered, Deputy Commissioner of Police (Southeast) Romil Baaniya said.
They were arrested after police put Roshan's mobile on surveillance on getting his number from his Facebook profile.
The police had extracted pictures of the accused from footage of a CCTV camera installed about 50 meters from the victim's house.
Sarita was found tied with rope and her mouth taped. She allegedly died due to suffocation, the police said.
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Their another servant, Rajan was also found tied with ropes. He told police that Roshan had allegedly let four men inside the house and they robbed the valuables and killed Sarita.
More than 150 police personnel were pressed into service to nab the accused and teams were sent all over Delhi and Uttar Pradesh at the potential hideouts and routes through which they could try to escape, the DCP said.
Even Rajan, who was hired around a couple of months, ago was not vetted by the police.
When police contacted the placement agency through which Roshan was hired it found his records turned out to be fake, the police said.
The police came to know that Roshan was active on Facebook by the name Balram and had even uploaded his pictures before the incident, the officer said.
During interrogation, Roshan, a native of Uttar Pradesh's Gonda district, told police that he used to sell Momos in Atta Market but had always aspired to live a luxurious life and wanted to own an Audi car.
He took to working as a domestic help in Sarita's house and found that her husband and son used to leave for work early while she used to be alone.
Sensing a good opportunity yesterday, he informed his accomplices Rawat, Sonu, Beni Prasad, Arvind who arrived there around 11.10 AM.
After carrying out the robbery, the accused divided the looted amount and valuables at Basai Darapur. A majority of which was with Roshan and Rawat.
It is suspected that the other accused have fled Delhi but the police have found some of their relatives and are questioning them.
The five accused were neighbours in Todapur and that is how they came in contact with each other.
The police are also verifying the antecedents of the placement agency through which Roshan was hired.
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